Expandable Collet Bodies with Sectional Finger-Based Anti-Rotation Feature, Clips, Inserts and Systems Thereof

A single-side fastening system comprising:

• a collet body comprising a cylindrical wall portion and one or more gripping fingers as a first part of a two-part anti-rotation means (ARM), the one or more gripping fingers extended longitudinally from the cylindrical wall and separated by one or more slots, the collet body defining a longitudinal axis and having a threaded inner surface and an outer surface, each of the one or more fingers having an extrusion at a fingertip as a first part of a two part translation arresting means (TAM), the one or more gripping fingers being flexible in a radial direction and biased to converge radically inward, the one or more gripping fingers diverging radically outward when pushed radically outward to cause the protrusions beyond the radical area defined by the cylindrical wall portion;
• a screw having a matching thread with the inner surface of the collet body;
• and
• an auxiliary structure having a second part as the of the two-part ARM, the second part having a complementary radical profile to the one or more gripping fingers, when the screw and the collet body are inserted into a proximal work piece, a distal work piece and the auxiliary structure, the one or more gripping fingers diverges radically outward pushed by a rotation of the screw within the threaded inner surface, cause rotational compression between the gripping fingers and the second part of the auxiliary structure, and restricts rotation of the collet body during a clamping process.

A method of clamping a proximal work piece and a distal work piece, the method comprising:

• inserting a screw into a collet body, a collet body comprising a cylindrical wall portion and one or more gripping fingers as a first part of a two-part anti-rotation means (ARM), the one or more gripping fingers extended longitudinally from the cylindrical wall, the collet body defining a longitudinal axis and having a threaded inner surface matching the screw, each of the one or more fingers having an extrusion at a fingertip as a first part of a two part translation arresting means (TAM), the one or more gripping fingers being flexible in a radial direction and biased to converge radically inward;
• inserting a sleeve insert into a proximal work piece hole in the proximal work piece, the sleeve insert comprising a cylindrical wall defining a bore between a proximal opening and a distal opening, the sleeve insert further comprising a flange extending from the cylindrical wall at the distal opening, the sleeve insert having a protuberance disposed within the bore at the distal opening such that the distal opening has an axial profile complementary to that of the gripping fingers, and therefore functions as the second part of the two-part ARM;
• inserting the screw and the collet body combination through at least the sleeve insert and a distal work piece hole in the distal work piece;
• and
• rotating the screw within the collet body to cause the collet body to move longitudinally to compress the distal workpiece and the proximal workpiece together with the extrusion of each gripping finger, wherein the distal workpiece functions as a second part of the two-part TAM.